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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]  
Summary of Financial Instruments with Off-Balance-Sheet Risks The amounts of financial instruments with off-balance-sheet risk are as follows:

 

 

 

December 31,

 

 

 

2019

 

 

2018

 

 

 

(Dollars in thousands)

 

Loan commitments

 

$

1,618,001

 

 

$

1,232,996

 

Stand-by letters of credit

 

 

64,702

 

 

 

56,096